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2.4

Measuring principle of the sensor

The measuring principle of the sensor is based on the Pressductor

®

  technology and the fact that

the permeability of a magnetic material changes under mechanical stress.

The sensor is a membrane machined in the load cell. Primary and secondary windings are wound
through four holes in the load cell so that they cross at right angles.

The primary winding is supplied with an alternating current which creates a magnetic field around
the primary winding. Since the two windings are at right angles to each other, there will be no mag-
netic field around the secondary winding, as long as there is no load on the sensor.

When the sensor is subjected to a mechanical force in the direction of measurement, the propaga-
tion of the magnetic field changes so that it surrounds the secondary winding, inducing an alternat-
ing voltage in that winding.
The control unit converts this alternating voltage into a DC voltage proportional to the applied
force. If the measurement force changes direction, the sensor signal changes also polarity.

Figure 10.  Propagation of magnetic field around secondary winding due to mechanical force on sensor

2.5

Mounting Arrangement

When choosing a mounting arrangement it is important to remember to position the load cell in a
direction that gives sufficient measuring force (F

R

) to achieve the highest possible accuracy.

The load cell has no particular correct orientation; it is positioned in the orientation best suited for
the application, bearing in mind the positions of the screw holes. The load cell can also be installed
with the roll suspended under the load cell.

The load cell has the same sensitivity in both tension and compression, so the load cell can be
installed in the easiest manner.

Typical mounting arrangements are horizontal and inclined mounting.

2.5.1

Coordinate System

A coordinate system is defined for the load cell. This is used in force calculations to derive force
components in the load cell principal directions.

 

Pressductor PillowBlock Load Cells, Vertical Measuring PFCL 201, User Manual 

2 Description 

14

3BSE023881R0101 en Rev H

Содержание PFCL 201

Страница 1: ... ABB MEASUREMENT ANALY TICS Pressductor Pillowblock Load Cells Vertical Measuring PFCL 201 User manual 3BSE023881R0101 en Rev H ...

Страница 2: ...B assumes no responsibility for any errors that may appear in this document In no event shall ABB AB be liable for direct indirect special incidental or consequential damages of any nature or kind arising from the use of this document nor shall ABB AB be liable for incidental or consequential damages arising from use of any software or hardware described in this document This document and parts th...

Страница 3: ...and Design 6 1 3 1 General 6 1 3 2 Load Cells PFCL 201 7 1 3 3 Principle of Measurement 7 2 Description 2 1 General 9 2 2 Technical Data 10 2 3 Definitions 11 2 4 Measuring principle of the sensor 14 2 5 Mounting Arrangement 14 2 5 1 Coordinate System 14 2 5 2 Horizontal Mounting 15 2 5 3 Inclined Mounting 16 2 6 The Electrical Circuit 17 3 Installation 3 1 General 18 3 2 Unpacking 18 3 3 Preparat...

Страница 4: ...nting Surface Support or Adapter Plates 26 6 4 2 Force Shunting 26 6 4 3 Fastening of Load cell and Adapter Plates 26 6 4 4 Rolls and Bearings 26 6 4 5 Driven Roll 26 6 5 Fault Tracing of Load Cells Junction Boxes and wiring 27 A Drawings A 1 Load Cell PFCL 201C Dimension Drawing 29 A 2 Load Cell PFCL 201CE Dimension Drawing 30 A 3 Load Cell PFCL 201CD Dimension Drawing 31 A 4 Adapter Plate Upper ...

Страница 5: ...count the envi ronmental aspects Our environmental management system certified to ISO 14001 is the tool for carrying out our environmental policy However it is on the customer s responsibility to ensure that local legislation is followed 1 2 2 Recycling Electrical and Electronic Equipment WEEE The crossed out wheeled bin symbol on the product s and or accompanying documents means that used electri...

Страница 6: ...ponents recycled according to local regulations 1 2 4 1 Dismantling and Recycling of the Product Dismantle and recycle the components of the product according to local regulations CAUTION Some of the components are heavy The person who performs the dismantling of the system must have the necessary knowledge and skills to handle heavy components to avoid the risk of accidents and injury from occurr...

Страница 7: ...tion force Depending on which control unit is chosen it is possible to have the analog signals for the two individual load cells A and B the sum of the load cell signals A B and or the difference between the load cell signals A B 1 3 3 Principle of Measurement The load cell only measures force in the direction FR The measurement force may be positive or negative The load cell is normally installed...

Страница 8: ...FR T T FV Wrap angle Wrap angle Figure 2 Measuring Roll with Force Vectors Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual 1 Introduction 8 3BSE023881R0101 en Rev H ...

Страница 9: ...D are available in four measurement ranges all variants have the same external dimensions The load cell PFCL 201C is equipped with a connector for the pluggable connection cable The load cell PFCL 201CE has a fixed connection cable with protective hose The load cell PFCL 201CD is provided with an acid proof cable gland with a fixed PTFE insulated connection cable Measurement direction Mounting scr...

Страница 10: ...25 2 5 5 12 5 Extended load in measuring direc tion with accuracy class 1 Fext 7 5 15 30 75 Max permitted load In the direction of measurement without permanent change of data Fmax 2 C CD CE 50 100 200 5003 kN In the transverse direction without permanent change of data FVmax 2 for h 300 mm 12 5 25 50 125 Spring constant C CD CE 250 500 1000 2500 kN mm Mechanical data Length C CD CE 450 mm Width C...

Страница 11: ... System Pressductor System h 2 Fmax and FVmax are allowed at the same time 3 Max permitted load for the load cell is 10 Fnom The overload capacity for the total installation may be limited by the screws h Building Height 2 3 Definitions Nominal load Nominal load Fnom is the maximum load in the measurement direction for which the load cell is dimensioned to measure within the specified accuracy cla...

Страница 12: ...e drawn between the output values at zero load and nominal load Linearity deviation is related to the sensitivity Signal Force Fnom Figure 7 Linearity Deviation Hysteresis Hysteresis is the maximum difference in the output signal at the same load during a cycle from zero load to nominal load and back to zero load related to the sensitivity at nominal load The hysteresis of a Pressductor transducer...

Страница 13: ...s of the load cell are not necessarily maintained in the whole working temperature range Storage temperature range Storage temperature range is the temperature range within which the load cell can be stored Zero point drift with temperature Zero point drift is defined as the signal change with temperature related to the sensitivity when there is zero load on the load cell Sensitivity drift with te...

Страница 14: ...l to the applied force If the measurement force changes direction the sensor signal changes also polarity Figure 10 Propagation of magnetic field around secondary winding due to mechanical force on sensor 2 5 Mounting Arrangement When choosing a mounting arrangement it is important to remember to position the load cell in a direction that gives sufficient measuring force FR to achieve the highest ...

Страница 15: ...quations below must be used FR T sin α sin β FRT Tare FRtot FR FRT T sin α sin β Tare FV T cos β cos α FVT 0 FVtot FV FVT T cos β cos α 0 T cos β cos α where T Strip tension FR Force component from strip tension in measurement direction R FRT Force component from Tare in measurement direction R FRtot Total force in measurement direction R FV Force component from strip tension in transverse directi...

Страница 16: ...ion R FRT Force component from Tare in measurement direction R FRtot Total force in measurement direction R FV Force component from strip tension in transverse direction V FVT Force component from Tare in transverse direction V FVtot Total force in transverse direction V Tare Force due to tare weight α Deflection angle on one side of the roll relative the horizontal plane β Deflection angle on the...

Страница 17: ...iagram The load cell is supplied with a 0 5 A 330 Hz alternating current The secondary signal is calibrated for the correct sensitivity with a voltage divider R1 R2 and temperature compensation is provided by thermistors T All impedances on the secondary side are relatively low The output impedance is typically 9 12 Ω which helps to suppress interference Pressductor PillowBlock Load Cells Vertical...

Страница 18: ...must be designed to allow axial expansion of the roll with changes in temperature Any drive to the roll must be applied in such a way that interfering forces from the drive are kept to a minimum The measuring roll must be dynamically balanced The mounting surfaces of the load cells must be on the same height and parallel with the measuring roll In a corrosive environment galvanic corrosion may occ...

Страница 19: ...roll to the upper adapter plate but do not fully tighten the screws 6 Adjust the load cells so that they are in parallel with each other and in line with the axial direction of the roll Torque tighten the foundation screws 7 Adjust the roll so that it is at right angles to the longitudinal direction of the load cells Torque tighten the screws in the upper adapter plate 8 Apply rust protection to a...

Страница 20: ... or right as indicated in Figure 16 Position of cable from factory page 20 This as possible forces in the longitudinal direction of the cable hose due to temperature will act perpendicular to the measuring direction of the load cell the direction in which the load cell is insensitive to loads For achievable cable directions see Figure 17 Possible directions of cable for PFCL 201CE page 21 The dire...

Страница 21: ...able for PFCL 201CE CAUTION Cable bending is not allowed in the connection Pressductor Technology R Figure 18 Cable bending wrong installation Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual 3 Installation 3BSE023881R0101 en Rev H 21 ...

Страница 22: ... to the correct torque that all cables are correctly installed and connected that all connectors are plugged in 4 2 Preparatory Calculations To be able to set the correct measuring range the measurement force per load cell FR 2 at maxi mum tension T must be calculated Each load cell is subjected to half the total measurement force FR This calculation must be done before commissioning can begin Cal...

Страница 23: ...cessary 5 3 Spare Parts Users are recommended to keep the following spare parts in stock One load cell of correct type and size One connector complete with cable for PFCL 201C Table 4 Ordering numbers for Load Cell PFCL 201 Description Type Nominal load kN Ordering numbers Load cell Load cell PFCL 201C 5 0 3BSE027070R5 Load cell Load cell PFCL 201C 10 0 3BSE027070R10 Load cell Load cell PFCL 201C ...

Страница 24: ...0 0 3BSE029774R10 Load cell Load cell PFCL 201CD 20 0 3BSE029774R20 Load cell Load cell PFCL 201CD 50 0 3BSE029774R50 Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual 5 Maintenance 24 3BSE023881R0101 en Rev H ...

Страница 25: ...ely robust and can withstand ten times their nominal load in the meas uring direction If a load cell has nevertheless been so overloaded that its data have been altered this is probably due to an event in the mill such as strip breakage On excessive overload the first thing that happens is that the zero point shifts Problems such as interference or unstable zero point may be caused by wiring fault...

Страница 26: ...ctual strip tension 6 4 3 Fastening of Load cell and Adapter Plates Screw joints that have not been properly tightened or have lost their pre tightening force cause sliding at the mating surfaces Fastening of the load cell is especially critical If a load cell is not properly secured the zero point will be unstable Sliding between other surfaces may cause the same symptoms 6 4 4 Rolls and Bearings...

Страница 27: ...o the load cell is the part that is most exposed to damage Since the resistance of the load cell windings is low it is easy to check the load cells and cabling from the control unit Typical readings are 2 Ω for the resistance of the primary winding and 9 12 Ω for the output impedance of the secondary winding Insulation faults in the cabling or the load cell may cause incorrect sensitivity or unsta...

Страница 28: ...A Drawings Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 28 3BSE023881R0101 en Rev H ...

Страница 29: ...A 1 Load Cell PFCL 201C Dimension Drawing Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 3BSE023881R0101 en Rev H 29 ...

Страница 30: ...A 2 Load Cell PFCL 201CE Dimension Drawing Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 30 3BSE023881R0101 en Rev H ...

Страница 31: ...A 3 Load Cell PFCL 201CD Dimension Drawing Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 3BSE023881R0101 en Rev H 31 ...

Страница 32: ...A 4 Adapter Plate Upper PFCL 201 Dimension Drawing Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 32 3BSE023881R0101 en Rev H ...

Страница 33: ...A 5 Adapter Plate Lower PFCL 201 Dimension Drawing Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Appendix A Drawings 3BSE023881R0101 en Rev H 33 ...

Страница 34: ...s 12 linearity deviation 12 nominal load 11 repeatability error 13 sensitivity 11 sensitivity drift 13 with temperature 13 working temperature range 13 zero point drift 13 Pressductor PillowBlock Load Cells Vertical Measuring PFCL 201 User Manual Alphabetical index 34 3BSE023881R0101 en Rev H ...

Страница 35: ......

Страница 36: ...3BSE023881R0101 en Rev H ABB AB Industrial Automation Force Measurement SE 721 59 Västerås Sweden Tel 46 21 32 50 00 Internet www abb com striptension Measurement Analytics ...

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